320261861 has 8 divisors (see below), whose sum is σ = 339372504. Its totient is φ = 301181440.

The previous prime is 320261849. The next prime is 320261873. The reversal of 320261861 is 168162023.

It is an interprime number because it is at equal distance from previous prime (320261849) and next prime (320261873).

It can be written as a sum of positive squares in 4 ways, for example, as 140541025 + 179720836 = 11855^2 + 13406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320261861 - 2⁶ = 320261797 is a prime.

It is a super-2 number, since 2×320261861² = 205135319222366642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320261831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16481 + ... + 30201.

It is an arithmetic number, because the mean of its divisors is an integer number (42421563).

Almost surely, 2^320261861 is an apocalyptic number.

It is an amenable number.

320261861 is a deficient number, since it is larger than the sum of its proper divisors (19110643).

320261861 is a wasteful number, since it uses less digits than its factorization.

320261861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15111.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 320261861 is about 17895.8615607073. The cubic root of 320261861 is about 684.1769011399.

The spelling of 320261861 in words is "three hundred twenty million, two hundred sixty-one thousand, eight hundred sixty-one".